Drilling and reaming jig bushing



Feb. 21, 1928. 1,660,190

W R. FISHER DRILLING AND HEAMING IIG- BUSHING I Filed NOV. 17, 1923 Patented Feb. 21, 1928.

UNITED STATES 1,660,190 PATENT OFFICE.

W REUEN FISHER, 01F DETROIT,-MICHIGAN, ASSIGNOR, BY MESH ASSIGNMENTS, TO JOHN L. GEYER, LORENZ 0. LIST, AND OTTO TBINKLEIN, TRUSTEES.

DRILLING AND BEAMING JIG BUSHING.

Application filed November 17, 1923. serial 110. 675,418.

' It is found in the use of drilling and reaming jig bushings that frequently the bushings become tight in the liner or jig and it requires considerable exertion to remove the drill bushing.

This is especially true of the locking mechanism as it frequently binds and becomes clogged with chips, dirt, etc.

Frequently when pressing the liner bushing'into the jig plate the proper amount of press fitting is not obtained, therefore any un-- due strains is quite likely to rotate the liner. Quite frequently, in cases where the drill bushing is made fast to the liner, a tendency to turn the liner bushing in the jig plate is often encountered by the seizing of the drill or 'reamer due to expansion. The turning of the liner destroys the center distance location of the hole and requires a reboring and re-bushing of the jig.

The object of this invention is to provide a bushing with a free locking means that will be. easily and readily locked and unlocked by the user. i

Another object of this invention is to provide a drill or reamer bushing adapted to be retained in a liner with a locking means engaging the drill or reamer bushing direct with the jig plate.

A further object of this invention is to provide a drilling and reaming bushing that will be to all practical purposes, immune from clogging with chips, dirt, etc.

The term drill or reamer bushing as used throughout these specifications and claims is construed to mean and include. a bushing adapted to guide a drill, rcamer, taps, boring bars, etc.

The term liner bushing or master. bushing as used throughout. these specifications and claims is construed to mean and include a bushing for receiving a drill or reamer bushing.

In reference to the accompanying drawin s:

T igure 1 is a central sectional view of my preferred type of bushing.

Figure 2 is a side elevation of drillmg and reaming bushings.

Figure 3 is a view looking m the direct on of the arrows 3-3.

-Figure 4 is a view taken on the line 1-4 of Figure 1.

Figure 5 is a central sectional view of a modified form of my invention.

flange 5 and the hollow cylindrical body 6.

The liner bushing 4 is mounted in the jig plate 7. The usual method of mounting the llner bushing 5"is by means of a press fit nto the jig plate 7. The liner bushing 5 1s provided with the opening 8 which has the ball seat 9 permitting the ball 10 to reside in the opening 8 and to project into the internal diameter of the liner bushing 4. The curved formation of the ball seat 9 prevents the ball fromfalling. out. The ball 10 is inserted from the outside of the liner bushing and 'is retained by the jig plate after the liner has been inserted therein. On the body of the'drill bushing 1 is provideo the angular groove or recess 11 connecting a longitudinal groove 12. The ball 10 is loosely mounted in the opening 8 and one side of the ball is permitted to rest against the jig plate 7.

From the above description it will be ap parent that when the drill'bushing 1 is inserted in the liner 4 and rotated until the groove 12 is in line with the ball 10, a slight longitudinal movement brings the groove 11 to the ball 10 a further rotary movement engages the ball on the incline of the groove 11,'securely locking the bushing. 95 As the pressure exerted by the inclined groove 11 is on the lower portion thereof, the ball 10 is forced against the jig plate 7 and locks the bushing directly to the jig plate, the ball being loose so that the thrust 100 is largely transmitted to the jig plate and thus the torque removed from the liner.

Figure 5 is a modified construction of my preferred form of bushing having the flat 13 milled on the'bottom of the drill or ream- 105 er bushing.

Figure 7 shows another form of construction having the spiral recess 14 milled on the bottom of the drill or reamer bushing.

The last two type; described have the 110 same advantages of locking against a rotary movement as my preferred form of con.-

struction, but do not lock against a recip rocating movement.

Figure 8 shows another modification of construction, in which the roller 15 substituted for the ball and the groove or recess 16 formed to receive the roller 15. The upper portion 17, of the groove 16 may be concentric with the body or slightly eccentric to bind the roller 15 to the 'ig plate 20. The recess 18 for retaining t e roller 15 is of a radial formation permitting the roller 15 to project through the inner wall of theliner 19.

a This last 'form locks the bushing against rotary and reciprocating movements, but the groove has not the inclination of my pre-- ferred form. The inclination lifts the bushin when it is being unlocked.

hus having described my invention, what I claim is new, and desire to secure by Letters Patent, is:

1. A. liner bushing adapted for mounting in a jig plate; a guide bushing adapted for a slip fit in said liner "bushing and means carried by one of said bushings for locking said guide bushing against relative movement to said liner bushing and for locking said liner bushing against relative movement to said jig plate.

2. A liner bushing adapted for mounting in a jig plate; a guide bushing adapted for a slip fit in said liner bushing and means carried by said liner bushing for locking said guide bushing against relative movement to said liner bushing and for locking said liner bushing against relative movement to said jig plate.

3. A liner bushing adapted for mounting in a jig plate, said bushing having an opening formed adjacent one end thereof; a locking member loosely positioned in said openin said opening having curved sides,

said 100 'n member being ofgreater diameter than t e thickness of the wall of said liner bushing; a guide bushing adapted for a slip fit in said liner bushing provided with a recess for the accommodation of said locking member, said locking member being adapted for retaining said ide bushing and said liner bushing in'fixe position relatively to said jig plate.

bushing relatively tosaid liner bushing be yond a predetermined point, said locking member upon tending to ride over said walls serving to lock said liner bushing relatively to said jig plate.

5. A liner bushing adapted for mounting in a jig plate; a locking member carried by said liner bushing; a guide bushing adapted for a slidable fit into said liner bushing, said guide bushing being provided with a curved walled recess for the accommodation of said locking member, said locking member being adapted for riding, through aslight distance, oversaid curved Wall of said recess and being adapted upon riding over said wall for locking said liner bushing relatively to said jig plate.

6. In combination with a liner bushing adapted for mounting in a jig plate and for the loose reception of a guide bushing, means mounted in said liner bushing engageable with said guide bushing for lockmg saidliner bushing against movement relatively to said jig plate.

7. A liner bushing; a guide bushing adapted for a slip fit in said liner bushing, said guide bushing having an axially extending groove formed on its periphery communicatin with a spirally directed groove, said liner bushing having a radial openin formed therein; a locking member inserta 1e into said opening from the periphery of said liner bushing and engageable in said groove for locking, upon 1nward pressure being directed on said lockin member, said liner bushing and said guide bushing relatively to each other, the rotation of said liner bushing relatively to said guide bushing in one direction beyond a predetermined degree effecting a locking of said bushings relatively to each other rotatively and axially.

In testimony whereof I hereunto afiix my signature.

W. REUEN FISHER. 

